102 lines
2.4 KiB
ArmAsm
102 lines
2.4 KiB
ArmAsm
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//++
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//
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// Copyright (c) 1996 Intel Corporation
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// Copyright (c) 1989 Microsoft Corporation
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//
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// Module Name:
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//
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// ldrthunk.s
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//
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// Abstract:
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//
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// This module implements the thunk for the LdrpInitialize APC routine.
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//
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// Author:
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//
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// William K. Cheung (wcheung) 19-Sep-95
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//
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// Revision History:
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//
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// 08-Feb-96 Updated to EAS2.1
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//
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//--
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#include "ksia64.h"
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.file "ldrthunk.s"
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PublicFunction(LdrpInitialize)
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//++
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//
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// VOID
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// LdrInitializeThunk(
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// IN PVOID NormalContext,
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// IN PVOID SystemArgument1,
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// IN PVOID SystemArgument2
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// )
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//
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// Routine Description:
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//
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// This function computes a pointer to the context record on the stack
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// and jumps to the LdrpInitialize function with that pointer as its
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// parameter.
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//
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// Arguments:
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//
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// NormalContext (a0) - User Mode APC context parameter
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//
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// SystemArgument1 (a1) - User Mode APC system argument 1
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//
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// SystemArgument2 (a2) - User Mode APC system argument 2
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//
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// Return Value:
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//
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// None.
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//
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//--
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NESTED_ENTRY(LdrInitializeThunk)
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NESTED_SETUP(3,2,3,0)
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mov out2 = a2
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;;
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PROLOGUE_END
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//
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// SP points at stack scratch area followed by context record.
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//
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add out0 = STACK_SCRATCH_AREA, sp // pointer to context
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mov out1 = a1 // copy args
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br.call.sptk.many brp = LdrpInitialize
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//
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// S0 in the context record contains the PLabel. Fix IIP/GP in the context
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// record with the entry point and gp values pointed to by S0.
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//
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add t7 = CxIntGp+STACK_SCRATCH_AREA, sp // -> global pointer
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add t2 = CxIntS0+STACK_SCRATCH_AREA, sp // -> PLabel pointer
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add t11 = CxStIIP+STACK_SCRATCH_AREA, sp // -> func pointer
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;;
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ld8 t8 = [t2] // get the function pointer
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mov brp = savedbrp // restore brp
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mov ar.pfs = savedpfs // restore pfs
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;;
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ld8 t5 = [t8], PlGlobalPointer-PlEntryPoint // get entry point
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;;
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ld8 t6 = [t8] // get gp
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nop.i 0
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;;
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st8 [t11] = t5 // set iip to entry point
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st8 [t7] = t6 // set gp
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br.ret.sptk.clr brp
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NESTED_EXIT(LdrInitializeThunk)
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